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<H3>compute erotate/sphere/atom command 
</H3>
<P><B>Syntax:</B>
</P>
<PRE>compute ID group-ID erotate/sphere/atom 
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
<LI>erotate/sphere/atom = style name of this compute command 
</UL>
<P><B>Examples:</B>
</P>
<PRE>compute 1 all erotate/sphere/atom 
</PRE>
<P><B>Description:</B>
</P>
<P>Define a computation that calculates the rotational kinetic energy for
each particle in a group.
</P>
<P>The rotational energy is computed as 1/2 I w^2, where I is the moment
of inertia for a sphere and w is the particle's angular velocity.
</P>
<P>IMPORTANT NOTE: For <A HREF = "dimension.html">2d models</A>, particles are treated
as spheres, not disks, meaning their moment of inertia will be the
same as in 3d.
</P>
<P>The value of the rotational kinetic energy will be 0.0 for atoms not
in the specified compute group or for point particles with a radius =
0.0.
</P>
<P><B>Output info:</B>
</P>
<P>This compute calculates a per-atom vector, which can be accessed by
any command that uses per-atom values from a compute as input.  See
<A HREF = "Section_howto.html#howto_15">Section_howto 15</A> for an overview of
LAMMPS output options.
</P>
<P>The per-atom vector values will be in energy <A HREF = "units.html">units</A>.
</P>
<P><B>Restrictions:</B> none
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "dump.html">dump custom</A>
</P>
<P><B>Default:</B> none
</P>
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